Radio apparatus



RADIO APPARATUS Original Filed May 12. 1922 2 Sheets-Sheet 1 INVENTOR EDWARD G. GAGE ATTTRNEY Jan. 8, 1935. E. G GAGE 1,986,890

. RADIO APPARATUS Original Filed May 12, 1922 2 Sheets-Sheet 2 EDWARD a. GAGE The present application is a divisionioflmy prior United States application serial No. 560,298. filed; May .12, .1922, P tent No.1 1,70%;538 granted 'Aprili s .This inventionrelates to the mamatstn;

V these'coils are so relatively movable that. they can be brought into. 'such desired. relationship that, i the coupling maybe made as 1oosej or *closeif asdesired. Itls also usual to provide means for varying the oscillation period of the circuit. such asb'y varying the capacity or inductance, or both. :Such devices are-usually mounted upon aboard; audit is the main, object of the present invention to so combine such coil struc'tures with thepanel; board on which it is mounted and with-the-ad: justing means for the oscillation periodvthat dea sired adjustmentsmay be efiected as quickly and conveniently aspossible; r 1 c I ,[51 f r The above. object; may be attained Icy providing an improved coil structure and; mounting, i one of the coils maybe pivotally mountediand upon the pivotally mounted section is also mounted means for tuning .ii'e. varying the oscillation period as by varying the 1 number of n turns of the coil or a condenser or other suitable means; This may be conveniently: accomplished by piv'otally mounting one'section of the panel'board; mount ingone. of the coils \thereonqand' also'mounting thereon thetuning means. r {The handle: for the tuning means may also be used to turn the coil on its pivot to vary the f cow pling whereby convenience andspeedin; operation is attained. Furthermore th'epivotalmounting permits any desired adjustment of the rcou pling without causing iundue, projection tot the partsifrom the face, of the panel'at any time so that the apparatus is compacts; 1 other and ancillary objects of ap'pearhereinafter. n i t 1; In "the accompanying drawings gwhich illustrate bhe inventionlz n i 1 is; A

Fig.1 is a perspective view'of a-cabinet-ior a raziio terephone' receiver. set, the-iircnt otzwhich I 1 proArrAnArUs k Edward. one; Brooklyn, .72., for I g one-halt; to IJoydQ. Slocumb, Ferguson, Mm, and one-halfqtojRadio Corporation oLAmerica, acorpor'ation ofhelaware f 1 V Original application EM ay' 12, 1922, 1

8, w P t n N 7. 8s 38, flu d Ave l 9,1929- Divided andthisiapplication January 21, 1929, s ia nolss ipss j ,1 5 ll l reclaims, (Cline- 40y the invention will to the present invention ismountedeertain parts;

of the set beingomitted for the sake-of clearness;

Fig. 2 ,is atop plan view, on; an enlarged scale, of 1 the" apparatus of 1 with; the, top ooverof the cabinet removed and partly brokenaway; i

Fig; 5315: an :'elevation-,lookingiron the leftofl I Fig. 6 isga diagram of electrical connections showing the-manner of connecting. the improved apparatusinaradiocircuitand v p i Figs? is; a viewsimilarto Fig.23showing a modified form oi period varying means. l p r; i slflis -aii diagram of; electrical connections showingthez mannerof, connecting the modificationshowninFig; 'Z-in acircuitof thetype shown inFi .6. p ,Referrings-togthe drawings and :first: to Figs. 1 to 6 inclusive,;.;the ;;radioj =i receiving r set therein shownlcomprises a cabinet having its front formed by the panel-board 1 while; apparatus ;on the back an-elev'ationilookingfrom theright ofl transmittal;mantras apparatus accordingof the gpanel 1 board.- is 1.;enclcsed rin-a; housing ,2;-

back of; the lpanelboard- 1 which is madeuof gwood fiber or other suitable material is'mounted; the

primary coil 3 by means of a bracket 4 of any suitable construction. #ThejcoilB isqstationary but the number: of r effective; turns ,1 in the coil may be varied by taps 5 from different points in the coil which taps" are respectivelyyconnected with the contact buttons or point;:6 respectively adapted to engage with one end of theim tal-contact arm 7. the other, end jOf' this n arm connectinggwith the contact-segment 8 to which a suitable circuitcon nection'is made, an example of which will be. h re: inafterreferredto;w i i 1 :It willbeapparent that the number of turns of the coil 3 -included inthe circuit will depend upon theposition oflthe arm "(and that these turns may beincreased or diminished by turningthe arm in one direction orthe other by meansoia suitable insulating handle9.- r y l I To; provide suitableinsulat ing mounting for the switch mechanism comprising the contacts 6 and 8 a disk 10 of bakelite may be inserted in the r eln Y I h nsi... Q flJlQnt .Q n u t v vi ela i na tom co 1 3ens nm un e n w n action or brake upon the bracket so that the coil will not accidentally be dislodged from position to which it may be adjusted.

Secured to the bracket 12 'is'="another"bakelite disk 1'7 mounted in a correspondingly shaped; opening in the panel board but'having sufiicientf clearance so that it may not interfere with the movement of the pivoted structiir'e a's referredto; Mounted upon the bakelitedisk 17, is s'egmenm contact 18 engaging one end of the contact armf'19,

the other end of that am successively engaging with the contacts as the arm 19 isliurned in;

one direction or the other by means of the insulating handle 21. The contacts 20 -are"re=f spectively' connected by means of taps'22 with suitable separated points dfthc'coilll; I

It'willj nowbe seen that the handle 21 can "be grasped and the pivoted structure turned in one direction or the'other so as t'omore intimately or remotely associate the -coils3 and 1'1 and'thereby make the coupling as loose or as close -as maybe-desired. Also this'same handle may be employed to vary the number of turns of the coil' 11 which i are in circuit and so tune the" circuit to the desired period. By providing a common.

handle for thus" varying the coupling and -for tuning the apparatus; convenience and speed of adjustment are very greatly enhanced. Furv thermore, with the structure shown,'-"it willbe seen that the movable structure comprising the adjustable coil 11 does not" move perpendicular to"the-- panel so that the operating "handle-is always easily. accessible from the front of the panel. This is of advantage a'scompared :with, for instance, an arrangement whereby the movable coil is'moved in' a path perpendicular to the panel-to adjust the coupling because,'in the last mentioned case, the handle is liable to be pushed so far in as'notto be'accessible or-moved sofar outas to form an awkward and easily damaged projection; In the structure of the drawings the adjustable coil 11'; it :will be-observed'; has a motion which has a component horizontal to thepanelf v It is' also to be observed that tuning may be accomplished by variation of the-turns of the coil 3 in circuit by 'turn'ing the handle'9 as before referred'td Referring n'owto Fig. 6 it will be seen that the aerial 23 is connectedwith the segment '8 whence connection is made by' the contact arm '7 with one of the contacts 6 and thence through the coil -3'-to' the ground at-'24, the number of turns of' the coil-'3 included between the aerial and ground depending upon the position of thearm '7.

The 'coil "1-I, 'as before stated, has taps: connected respectively with the contacts 20, the coil 11 being connected in anysuitable secondary or, closed oscillation circuit by-means of leads 24 and 25 "one ofwhich'is connected with the contact segment 18 and the other'with one of the endoi the coil 11, ;It will beapparent that tuning of -the oscillation circuit may be'accomplished by including 'a greater or' less number of turns of the coil 11 in circuit in a manner as before described. 'I'he}oscillation'- circuit here shown including the conductor-s24 and 25is the inputcircuit of a vacuum tube wherein the circuit is completed across the intervening space from the filament to the grid.

Referring now to Fig. '7, the tuning of the oscillaticn cincuit. is" effected by the variable condenser 26, whichniay be'of'any suitable or well known construction connected in series in the circuit and the movable member of which may beturnedby means of a handle 21' mounted upon the bakelite disk 17 which in turn is mounted upon the'jpivoted bracket 12' carrying the secondary' coili11" in amanner as described in con-- nectionfu rithfll igs, 1"to 6 inclusive. It will be seen that in this case the pivoted member comprises :the panel section 17, condenser 26 and the secondary coil ll and as its pivoted member is swung the coil 11' is brought into more or less intimate relation'with the primary coil 3 which may be mounted and adjusted as described in conwhich are similar to those shown in Fig.. 6' are siniilarly'designated; I Thus; asin Fig. 6, the coils 3"and -1'1 are shown as variably coupled by an arrow-between' them. ='I'he coil 3 is represented as variable by an arrow through it, this simple.

and well known representative :being adapted instead'of'that shown-in Fig; 6. As stated above, the-variable condenser 26' efiectstuning of the oscillation circuit including the coil 11', the condenser? being connected "in'series-in the circuit. By means of the'leads 24, 25 the coil 11 and condenser 26,both comprising the'oscillation input circuit of the tube,-'are'connected between the grid and cathodeofthe tube, the output circuit of the -Iat'ter being connected to the output cir-' c'uit, which, as shown in Fig. 6, includes the head phones. By means -ofthe handle '21.; mechanically associated with-the movable member of condenser 26 and the coil bracket 12', there is provided a' 'commonmeans forvarying the coupling between the'antenna'circuit, or source of signal energy, and the tuned input circuit of the tube for tuning thesaid-inputcircuit, convenience and speed of adjustment being-very, greatly enhanced thereby. r

While the invention has been illustrated in what are considered its best applications it may have other-embodiments without: departing from its spirit-and is-not therefore-limited to the structures-shown in the drawings. '-WhatIcla im is: W

1. Th'e'combination with a coil, of asecond coil in inductive relation thereto and movable with relation thereto to vary the coupling between said coils,'means for varying the oscillati'on" period of a circuit comprising a variable condenser, 'saidperiod varying means and said second coil being secured together in a unitary structure movable with relation tosaid first mentionedcOiI; Y 1 1 l l 2.:Thecombination with a panel board having a movablesection, of acoil-mounted on said panel'board, a second coil in inductive relation thereto 'and movable with relation thereto to vary'thecoupling-between said coils and means for varying the oscillationperiod of .a circuit comprising 'a variable condenser, said period varying means, said movable panel board section and'said second coil being secured together in a unitary structure movable with relation to said first mentioned coil;

- 3."The combination with a coil, of a second coil in inductive relation thereto and movable i with relation theretoto vary the coupling between said coils, means for varying the oscillation period of a circuitcomprising a variable condenser, saidgperiod varyingmeans and said sec ond coil being secured together in a unitary structure movable with relation to said first mentioned coil.

4. The combination with a panel board having a movable section, of a coil mounted on said panel board, a second coil in inductive relation thereto and movable with relation thereto to vary the coupling between said coils and means for varying the oscillation period of' acircuit comprising a variable condenser, said period. varying means, said movable panel board section and said second coil being secured together in a unitary structure movable with relation to first mentioned coil. r 5. Thecombination with a coil, of a second coil in inductive relation thereto and movable with relation thereto to vary the coupling between said coils, means for varying the oscillation period of a circuit comprising a variable condenser, said period varying means and said second coil being secured together in a unitary structure, said structure being adjustably mounted with. respect to said first mentioned coil, and said period varying means being rotatably mounted upon said so 7 structure.

6. The combination with a coil, of asecond coil in inductive relation theretoand movable with relation thereto to vary the coupling between said coils, means for varying the oscillation periodof a circuit comprising a variable condenser, said period varying means and said second coil being secured together in a unitary structure, said structure being adjustably mounted with respect to said first mentioned coil, and said period varying means being rotatably mounted upon said structure.

7. The combination with a panel board having a movable section, of a coil mounted on said panel board, a second coil in inductive relation thereto :spect to said first mentioned coil, and said pesaid structure.

and. movable with relation thereto to vary the coupling between said coils and means for varying theoscillation period of a circuit comprising a variable condenser, saidperiod varying means, said movable panel board section and said second coil being secured together in a unitary structure, said structure being adjustably mounted with reriod varying means being rotatably mounted upon 8. The combination with a panel board having a movable section, of a coil mounted on said panel board, asecond coil in inductive relation thereto e i said movable panel board section and said second coil being secured together in a unitary strucand movable with relation theretoto vary the coupling between said coils and means for varying the oscillation period of a circuit comprising a variable condenser, said period varying means,

- ture, said structure :beingadjustably mounted with respect to said first mentioned coil,and said period varying means being rotatably mounted upon said structure. l o

9. In combination, in a radio receiver, a source of signal energy, an electron discharge tube provided with an input and output circuit and includsaid i ing a grid, cathode and anode, said input circuit being connected to said grid and cathode, means f i for coupling said source to said tube input circuit, said means comprising a transformer having a primary winding connected to said source and a secondary winding in said input circuit, a

:variable condenser connected to said secondary winding in the latter circuit, the condenser being connected between said grid and cathode, meansfor adjusting said condenser to tune the input circuitf'to'a desired signal frequency, and

a. common controlling member, mechanically associated with one of the and said adjusting means, operable to vary either said coupling or said adjusting means, or to vary both together. i i

1 0. In; combination with a source of signal energy an electron discharge tube having input and outputcircuits, means for coupling said source to said input circuit comprising a primary coil connected with said source and a secondary coilconnected in said input circuit, said coils being ininductive relationship, one thereof being rotatably mounted for adjustment with respect to the other whereby to vary the coupling between said coils, a variable, tuning impedance having an adjustable element for varying the oscillation period ofsaid input circuit, said adjustable element being rotatably mounted and a pivotal common support for one of said coils and said variableimpedance element.

11. A radio tuner comprising a variable condenser and an adjustable inductance, in combination with a common operating means arranged and connected to adjust the condenser rotatively and to adjust the inductance by displacement o the common operating means. i

12. A radio tuner comprising in combination, a shaft adjustable rotatively and displaceable as a whole, a variable condenser adapted and arranged foradjustment by rotation of said shaft and an inductance adapted andarranged for ad,- justment by displacement of said shaft.

13. A radio tuner adapted to accommodate infinitely fine gradual adjustment of wavelength, said tuner including a condenser device and an inductance device, each of adjustable character,

and a shaft mounted for both-rotary movementand displacement as a'whole whereby adjustment of said devicesmay be effected simultaneously,

through a combination of said movements.

14.,A radio tuner comprising a variable condenser and an adjustable inductance member appropriately connected electrically, in combination with a common aoperating shaft mounted to accormnodate rotarymovement and adapted to be displaced as a whole, means to adjust the condenser rotatively and to adjust the inductance is adjustable by the displacement of said shaft to vary the effect of said member.

EDWARD G. GAGE.

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